What is Tiki culture? Its a way for bars and restaurants to promote the culture of the south pacific/tropical islands where these products originated. The drinks, usually the main attraction, come in various assortments, mostly sweet and very tasty.
A true tiki bar would have robotic birds, the steaminess atmostphere of the jungle, the pounding of drums, and the Polynesian god heads.
Check out this piece for more detail. Good luck in finding a bar-tender who can do a masterful job in creating these exotic and tasty drinks.

Read more: A primer on tiki culture